Accession Number : AD0631374

Title :   THE EFFECT OF PRESSURE ON THE MELTING POINT OF SODIUM HALIDES. REACTIONS OF PHENYL ISOCYANATE AT HIGH PRESSURES.

Descriptive Note : Final rept. on high pressure basic research programs, 1 Apr 64-31 Mar 65,

Corporate Author : ALLIED CHEMICAL CORP MORRISTOWN N J CENTRAL RESEARCH LAB

Personal Author(s) : Nienart,L. F. ; Bach,J. L. ; Beyleveld,W. M. ; Woolf,C.

Report Date : MAR 1965

Pagination or Media Count : 53

Abstract : The D.T.A. technique was used to obtain the fusion curves of NaBr, NaCl, and NaF to pressures of 12, 43 and 45 kilobars respectively. The constants c and A of the Simon melting equations were computed from the experimental results. At 16 Kb. and a temperature range of 175-225C phenyl isocyanate was converted to its cyclic dimer (1,3-diphenyl-2,4-uretidinedione) in greater than 90% yield. The dimerization reaction was favored by pressure. At higher pressures the temperature range was extended. Both the cyclic trimer (triphenyl isocyanurate) and another dimer of phenyl isocyanate (3-phenyl -2,4-dioxo-tetrahydroquinazoline) were the principal products formed at 16 Kb. and temperatures equal to or greater than 275C. At these higher temperatures CO2 was the sole gaseous product. This gas may arise by pyrolysis of yet another phenyl isocyanate dimer having a four membered ring lactone structure. At 8 Kb. and 250C the major product of the reaction is thought to be a 2:1 cyclic trimer of phenyl isocyanate and diphenylcarbodiimide. (Author)

Descriptors :   (*SODIUM COMPOUNDS, MELTING POINT), (*SALTS, MELTING POINT), (*NITRILES, CHEMICAL REACTIONS), (*HIGH PRESSURE, CHEMISTRY), BROMIDES, CHLORIDES, FLUORIDES, DIFFERENTIAL THERMAL ANALYSIS, AROMATIC COMPOUNDS, KETONES, NITROGEN HETEROCYCLIC COMPOUNDS, PYROLYSIS, CARBON DIOXIDE, LACTONES, HALIDES

Subject Categories : Inorganic Chemistry
      Organic Chemistry
      Physical Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE